EP0744307A1 - Amortisseur à double action amélioré - Google Patents

Amortisseur à double action amélioré Download PDF

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Publication number
EP0744307A1
EP0744307A1 EP96107742A EP96107742A EP0744307A1 EP 0744307 A1 EP0744307 A1 EP 0744307A1 EP 96107742 A EP96107742 A EP 96107742A EP 96107742 A EP96107742 A EP 96107742A EP 0744307 A1 EP0744307 A1 EP 0744307A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
shock absorber
outer body
stem
metal ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96107742A
Other languages
German (de)
English (en)
Other versions
EP0744307B1 (fr
Inventor
Nevio Di Giusto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0744307A1 publication Critical patent/EP0744307A1/fr
Application granted granted Critical
Publication of EP0744307B1 publication Critical patent/EP0744307B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/504—Inertia, i.e. acceleration,-sensitive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/06—Characteristics of dampers, e.g. mechanical dampers
    • B60G17/08—Characteristics of fluid dampers

Definitions

  • the present invention generally pertains to the field of automobile shock absorbers. More particularly, the invention relates to a device for varying the damping characteristics of a shock absorber while the vehicle is running along a bend.
  • shock absorbers With modern vehicles further comfort during running whilst providing road-holding features is a constant requirement. It is known that in order to have greater comfort the shock absorbers must have softer damping characteristics, while more rigid features are required to gain good road-holding along bends, especially at high speed. To this end there are known commercially available automobile shock absorbers the damping characteristics of which can be changed by the user. With such absorbers, the desired kind of response can be selected before or during running, depending on whether sports or normal driving is performed.
  • an automobile double acting shock absorber comprising an outer body and a stem with an end portion slidable within said outer body, said outer body delimiting two chambers separated by a diaphragm having ports for a fluid, said chambers communicating with each other through valves disposed at said end portion of the stem within said body and adapted for controlling the ports in said diaphragm, characterised by comprising a device for continuously varying the operational characteristics when a centrifugal force exceeding a preset threshold value occurs, said device consisting of a metal ring adapted for translation within a chamber delimited by said diaphragm and a second diaphragm provided with apertures obstructable by said ring during translation movement thereof.
  • numeral 1 designates a shock absorber counted to the body 2 of a vehicle.
  • the shock absorber is composed of a stem 3 sliding within a body 4 following the movement of the vehicle suspension 5.
  • valve means 7 are fitted at the lower end portion of the stem 3 within body 4.
  • Valve means 7 cooperate with ports 9 obtained in a diaphragm 10 fixed to the stem 3 in controlling the flow of the shock absorber fluid.
  • Said valves 7 and diaphragm 10 divide the body 4 in two communicating chambers 8a, 8b containing fluid which flows from one chamber to the other through the valves 7 and the ports 9 in diaphragm 10.
  • a second diaphragm 12 In an upper position with respect to diaphragm 10 there is provided a second diaphragm 12, also rigidly connected to the stem 3.
  • This second diaphragm defines with the first one an annular chamber 14 in which a metal ring 15 is disposed.
  • Said ring 15 has an inner aperture 17 formed by two flat walls 20, 21, radiused by semicircular walls.
  • the thickness of ring 15 substantially corresponds to the height of camber 14, but is such to allow ring 15 to slide therein due to the fact that the outer diameter of the ring is considerably less than the bore of said chamber 14.
  • the second diaphragm 12 has elongated apertures 23 around its perimeter. Depending on their size and position, these apertures can be partly or completely closed by the metal ring 15 as this translates. Said translation movement of ring 15 is possible only in the direction of arrow A (FIG. 3) as the two flat, parallel walls 20, 21 cooperate with two flat faces 30 provided on the end portion of the stem 3 which is of smaller diameter at chamber 14.
  • the ring 15 when the vehicle on which the shock absorber 1 is mounted enters a bend travelling at a speed which is higher than a preset threshold value, the ring 15 translates in the direction of arrow A due to the centrifugal force. The higher the speed, the greater the translation movement will be.
  • the apertures 23 are gradually obstructed by ring 15. Therefore, the fluid contained in the chambers of the shock absorber will have more difficulty in flowing from one chamber to the other, which will slow down the translation movement of the stem 3 and so vary the damping characteristics of the shock absorber.
  • the shock absorber will have a more rigid performance consequent to the greater speed at which a bend is run along.
  • an elastic member can be provided to facilitate ring 15 in returning to the rest position, such that on a straight road in the absence of centrifugal force the vehicle is able to recuperate its initial comfort characteristics.
  • FIG. 4 there is illustrated the possible behaviour of a shock absorber fitted with the device of the present invention. It is apparent that as the speed in the bend increases, the centrifugal force increases and consequently the rigidity of the shock absorber, either during compression or extension.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Vehicle Body Suspensions (AREA)
EP96107742A 1995-05-25 1996-05-15 Amortisseur à double action amélioré Expired - Lifetime EP0744307B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000413A IT1279560B1 (it) 1995-05-25 1995-05-25 Ammortizzatore a doppio effetto di tipo perfezionato.
ITTO950413 1995-05-25

Publications (2)

Publication Number Publication Date
EP0744307A1 true EP0744307A1 (fr) 1996-11-27
EP0744307B1 EP0744307B1 (fr) 2000-07-26

Family

ID=11413580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107742A Expired - Lifetime EP0744307B1 (fr) 1995-05-25 1996-05-15 Amortisseur à double action amélioré

Country Status (3)

Country Link
EP (1) EP0744307B1 (fr)
DE (1) DE69609451T2 (fr)
IT (1) IT1279560B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6102170A (en) * 1998-05-07 2000-08-15 Tenneco Automotive Inc. Passive anti-roll system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957703A (en) * 1956-08-16 1960-10-25 Howard S Ross Inertia responsive shock absorber arrangement for vehicle
BE660773A (fr) * 1964-03-11 1965-07-01
DE1209007B (de) * 1959-10-21 1966-01-13 Rheinmetall Gmbh Kurvenstabilisator fuer Kraftfahrzeuge
JPS57154539A (en) * 1981-03-13 1982-09-24 Toyota Motor Corp Shock absorber
US5154442A (en) * 1990-11-19 1992-10-13 Milliken Douglas L Self-contained acceleration-responsive adaptive damper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957703A (en) * 1956-08-16 1960-10-25 Howard S Ross Inertia responsive shock absorber arrangement for vehicle
DE1209007B (de) * 1959-10-21 1966-01-13 Rheinmetall Gmbh Kurvenstabilisator fuer Kraftfahrzeuge
BE660773A (fr) * 1964-03-11 1965-07-01
JPS57154539A (en) * 1981-03-13 1982-09-24 Toyota Motor Corp Shock absorber
US5154442A (en) * 1990-11-19 1992-10-13 Milliken Douglas L Self-contained acceleration-responsive adaptive damper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 260 (M - 180) 18 December 1982 (1982-12-18) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6102170A (en) * 1998-05-07 2000-08-15 Tenneco Automotive Inc. Passive anti-roll system
US6220406B1 (en) 1998-05-07 2001-04-24 Tenneco Automotive Inc. Passive anti-roll system
GB2338048B (en) * 1998-05-07 2002-07-24 Tenneco Automotive Inc Passive anti-roll system
DE19921125B4 (de) * 1998-05-07 2006-06-22 Tenneco Automotive Inc., Lake Forest Stoßdämpfer mit passiver Dämpfungsbeeinflussung
DE19964466B4 (de) * 1998-05-07 2010-04-08 Tenneco Automotive Inc., Lake Forest Stoßdämpfer mit passiver Dämpfungsbeeinflussung und Fahrzeugaufhängung mit solchen Stoßdämpfern

Also Published As

Publication number Publication date
ITTO950413A1 (it) 1996-11-25
IT1279560B1 (it) 1997-12-16
EP0744307B1 (fr) 2000-07-26
ITTO950413A0 (it) 1995-05-25
DE69609451D1 (de) 2000-08-31
DE69609451T2 (de) 2001-03-29

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